In order to study the hydraulic performance of a sprinkler under different pressures and clarify the effect of working pressure on other parameters, a type SD-03 pop-up sprinkler with the diameter of 5 mm was investigated experimentally in this paper. The flow, rotational speed, and radial water distribution of the sprinkler were measured under 200, 250, 300 and 350 kPa working pressures, but also its ranges under these pressures were calculated. The results show that the flow rate, range, rotational speed and spray irrigation intensity rise with increasing working pressure and exhibit a good regularity. An empirical formula for spray range is revised, and the corresponding correction coefficient for the formula is identified to be 0.5-0.6 under different pressures. A polynomial relationship between pressure and rotational speed is obtained and the distribution curve of sprinkler irrigation intensity is analyzed. Compared with the highest irrigation intensity at 200 kPa pressure, the highest irrigation intensity increases by 15.93%-18.67% when the pressure rises. It provides a scientific theoretical basis for the follow-up study of the buried sprinkler.
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